Muffler for internal-combustion engines



Oct 7; 1924.

' 1.. J. MARTEL MUFFLER iNTBRNAL COMBUSTION ENGINES Filed Aug. 12. 19217 3 "I 0 ,l n a 1 I A H m I 1 II H 1 l I .l H u 5 n H H l I 1 n U I 1 w,1 H H 1 v .1 a o, 7. I z 7 A J Fae l.

'ATTY.

W/ TNESSES Patented Oct. 7, 1924.

v UN T D STIAVTESI LEROY J. IABTEL, OF PLWTUCKET, RHODE ISLAND.

IUI'I'LER roa m'rnmun-c'onnvszrron nnenms.

Application fled Augult 12, 1921'. Serial 10.481360.

To all whom it may concern: r

Be it known that I, LEROY J. Maa'rnn, a citizen of the United States,residing at 87 Boyce Avenue, in the city of Pawtucket, in the county ofProvidence and State of Rhode Island, have invented certain new anduseful Improvements in Mufllers for Internal-Combustion Engines, ofwhich the following is a specification.

M invention relates to improvements in mu ers for internal combustionengines, and the purpose of my invention is to provide a device, simplein structure, of comparatively inexpensive construction, and which willreduce to a minimum the sound caused by the explosions of a motor of thetype mentioned, and at the same time create little or no back pressure.

These objects are accomplished by the mechanism disclosed by theaccompanying drawings, in which Figure 1 is a vertical section of mydevice upon the line C-C of Figures 2 and 3.

Figure 2 is a cross section upon the line a-a of Figure 1, and

Figure 3 is a cross section of my muffier upon the line b-b of Figure 1.

The same parts are designated by, the same characters throughout thevarious views.

In Fi 2-3 are also secured to the heads 10-40 by the rivets 7 '7 orother suitable means. portion of 'both members 2 and 3, as is shown,projects beyond and outside the muf fler head, as shown in the drawing,and each member terminates within the muflier" in-the funnel shapedortion 13-14.

At the inlet end 0 the mufller, and a short. distance from the funnelshaped'portion 14 of the member ,3, and lying partly within the same, isa conicalbaflie plate or s reader 4, supported by the perforated diaphra12 by rivets or other suitable means. e ist'ance between the conicalbafile plate re 1, 1 is a cylinder, preferably of meta, provided withheads 10-10 at 4 and the funnel shaped portion 14 is determined byexperiment, but issuch as to provide for the easy escape of the gaseswithout creating back pressure.

. In addition to the diaphragm 12, there is a like dia hragm 15 locatednear the' exhaust end o the muflier. This second diaphragm 15 issupported by being riveted to the outer wall of the mufller as, shown,and. a hollow tube 5 extends between the diaphragms 12 and 15 tostrengthenand stiflfen the entire constructionr' The diaphragms-12'15are perforated with a plu rality of holes 66, as shown best, in Figure2. The escaping gas from the engine entering by the inlet 3 is expandedby the conical member 4, finds its way through the holes 6 into the bodyof the mufiier, and thence makes its exitithrough like holes11 in thediaphragm 15 into the space between this diaphragm and the exhaustmember 2,

and the funnel shaped portion 13 permits of easy egress of the exhaustgas. The number of holes in the diaphragms'12-15 is immaterial, butshould be sufiicient in number and size to fully take care of the volumeof exhaust gas coming from the en 'ne.

t is evident that instead of the .funnel shaped interior ends of theinlet and outlet, hollow hemispherical ends may be used withoutdeparting from the principle of my invention. 7

In like manner the number of diaphragm; may be varied from one to three,or more, but satisfactory results are obtained with two as shown. 1

Iiaving now described my invention what I claim and desire to secure byLetters Patent is In a mufiier, a c annular heads, eac having anoutwardly projecting annular flange riveted to opposlte ends of saidbody portion, funnelshaped inlet and outlet members riveted to oppositeheads with their larger ends positioned within said body portion, spacedannular diaphragms having flanged outer ed es positioned within saidbody portion tures positioned concentrically with said lindrical bodyportion,

' tubular member and eutwardly of the same, and a conically-shape&spreader having radial ears riveted to one of said diephragms andextending into the funneL LEROY J. MARTEL. 6 shaped inlet fer thepurpose of directing Witnesses:

the inflowing gases outwardly toward the EDITH. M.:BR0MLEY,

apertures in one diephmgm C. E. PERRON.

In testimony whereof I afiix my signature in presence of two witnesses.

